1. 09 Mar, 2015 1 commit
  2. 23 Jan, 2015 1 commit
  3. 05 Dec, 2014 1 commit
    • arv's avatar
      Optimize GetPrototype · c8c73956
      arv authored
      This introduces Hydrogen for %_GetPrototype. The code falls back on
      runtime if the object needs access checks or if its prototype is a
      hidden prototype.
      
      BUG=None
      LOG=Y
      R=dslomov@chromium.org
      
      Review URL: https://codereview.chromium.org/756423006
      
      Cr-Commit-Position: refs/heads/master@{#25694}
      c8c73956
  4. 04 Dec, 2014 1 commit
    • adamk's avatar
      Optimize testing for an index's existence in packed Arrays · 6230641b
      adamk authored
      This patch introduces a new inline runtime function,
      %_HasFastPackedElements(), and uses it both in the implementation
      of the 'in' operator and in the array builtins to speed
      up testing for the existence of an index in an array.
      
      In testing with the microbenchmark on the attached bug,
      for example, the runtime goes from 326ms to 66ms.
      
      A reviewer might ask whether the HAS_INDEX macro is worthwhile,
      and I tried the same example without it, which pushed the
      microbenchmark up to 157ms. So it seems it's worth it to
      avoid the function call to IN() if we know we're dealing
      with arrays and numbers.
      
      BUG=v8:3701
      LOG=n
      
      Review URL: https://codereview.chromium.org/754863002
      
      Cr-Commit-Position: refs/heads/master@{#25665}
      6230641b
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